package com.bbz.crawler.core.page.processor;

import com.bbz.crawler.core.util.HttpClientDownloader;

import us.codecraft.webmagic.Page;
import us.codecraft.webmagic.Site;
import us.codecraft.webmagic.Spider;
import us.codecraft.webmagic.pipeline.ConsolePipeline;
import us.codecraft.webmagic.pipeline.JsonFilePipeline;
import us.codecraft.webmagic.processor.PageProcessor;

public class GithubRepoPageProcessor implements PageProcessor {

	// 部分一：抓取网站的相关配置，包括编码、抓取间隔、重试次数等
	private Site site = Site.me().setRetryTimes(3).setSleepTime(1000);

	@Override
	// process是定制爬虫逻辑的核心接口，在这里编写抽取逻辑
	public void process(Page page) {
		// 部分二：定义如何抽取页面信息，并保存下来
		page.putField("name", page.getHtml().xpath("//ol[@class='pinned-repos-list mb-4']/li/span/span/a/span/text()").all());
		if (page.getResultItems().get("name") == null) {
			// skip this page
			page.setSkip(true);
		}

		// 部分三：从页面发现后续的url地址来抓取
		page.addTargetRequests(page.getHtml().links().regex("(https://github\\.com/[\\w\\-]+/[\\w\\-]+)").all());
	}

	@Override
	public Site getSite() {
		return site;
	}

	public static void main(String[] args) {
		Spider.create(new GithubRepoPageProcessor())
				// 从"https://github.com/code4craft"开始抓
				.addUrl("https://github.com/code4craft")
				.addPipeline(new JsonFilePipeline("C:\\opt\\webmagic\\"))
				.addPipeline(new ConsolePipeline())
				// 开启5个线程抓取
				.thread(5).setDownloader(new HttpClientDownloader())
				// 启动爬虫
				.run();
	}
}